*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
}
aside{
    padding-top: 50px;
    text-align: center;
    float: left;
    width: 15%;
    height: 100%;
    background-color: rgb(52, 55, 74);
}

main{
    background-color: rgb(243, 244, 249);
    height: 100%;
    width: 100%;
}
iframe{
    padding: 0;
    margin: 0;
}
li{
    width: 170px;
    height: 40px;
    line-height: 40px;
    text-align: left;
    list-style: none;
    padding-left: 70px;
    transition: 0.3s;
    margin-top: 30px;
    border-top-right-radius: 50px;
    border-bottom-right-radius: 50px;
}
a{
    text-decoration: none;
    color: rgb(166, 181, 202);
}

li:hover{
    background-color: rgb(255, 192, 0);
    color: white;
    transform: 0.3s;
}